Proceedings of SerbiaTrib '13

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indicates that the formation of adhesive strengthbetween the transfer films and the counterpartsurface is strong. In the case of the counterpartsliding against the pure PTFE, the transfer film isvery thick.Figure 4. Weight loss vs. sliding speed at constantapplied load of 60 N and sliding distance of 1500 mFigure 6. Specific wear rate of PTFE with variouscontent of graphite flakesCompared to pure PTFE, composites showedstable coefficient of friction (Figure 7). The lowestcoefficient of friction was 0.20 for composites with2 and 5 wt. % of graphite. For composite with 10wt. % of graphite, the coefficient of friction wasslightly higher and close to the value obtained withpure PTFE. Anyway, variations of the coefficient offriction are very small.Figure 5. Wear curves of tested materials for 60 N loadand speed of 1.5 m/sEvaluation of the wear rate and coefficient offriction for graphite flake (2, 5 and 10 wt. %; 10μm) filled PTFE composites were studied byGoyal and Yadav [10]. It was performed on apin-on-disk tribometer under dry slidingconditions, at sliding speed of 1 m/s and 25 Nload (0.19 MPa), during 8000 m. A significantdecrease in wear of composites in compare topure PTFE is noticed. The wear rates ofcomposites with 5 and 10 wt. % of graphite weredecreased 22 and 245 times, respectively (Figure6). This decrease in wear rate is also attributed tothe formation of a thin and tenacious transfer filmon the counterpart surface.Figure 7. Coefficient of friction with various content ofgraphite flakesUnal et al. [11] also studied the friction andwear behaviour of pure PTFE and bronze (25, 40and 60 %) filled PTFE polymer composites underapplied load range from 5 to 200 N (0.18 – 7.07MPa) and sliding speed range from 0.32 to 2.0 m/s,using a pin-on-disc tribometer. The results showedthat bronze filled PTFE composite exhibited lowercoefficient of friction (Figure 8 and Figure 9) andhigher wear resistance (Figure 10) compared topure PTFE. The coefficient of friction of both –pure PTFE and bronze filled PTFE compositesdecreases when the applied load is increased from 5to 30 N (light condition). Above 30 N thecoefficient of friction remains stable.The PTFE filled with 60 % of bronze showedhigher wear resistance than pure PTFE. Thisbehaviour can be attributed to the presence of138 13 th International Conference on Tribology – Serbiatrib’13
onze, which is embedded within the matrixmaterial and impart additional strength to thecomposite. The applied load has shown moreinfluence on the wear behaviour of PTFE and PTFEcomposite than the sliding speed.In addition, it could be interested to present adiagram that shows dependence of specific wearrate on wt. % of filler materials (Figure 11) [12].Although there are filler materials which are notsubject of this paper, it might be interesting tocompare specific wear rate for different polymercomposites.Figure 8. Variation of coefficient of friction with slidingdistance (normal load: 50 N; sliding speed: 1.5 m/s)Figure 11. Specific wear rate vs. wt. % of filler materialfor various polymer composites(FEP – fluorinated ethylene propylene; PA6 – polyamide6; HDPE – high-density polyethylene; PA11 –polyamide 11; GF – glass fibre; PEEK – polyether etherketone; CNT – carbon nanotube)4. CONCLUSIONFigure 9. Variation of coefficient of friction withapplied load and sliding speed for PTFE andPTFE + 60 % bronze compositeIn this review paper, the tribological behaviourof PTFE composites, filled with glass fibres,graphite flakes, carbon, bronze or combination ofmentioned filler materials has been analysed.It is noticed that coefficient of friction usuallyremains in the range from 0.1 to 0.3. When purePTFE is compared with PTFE composites, there isonly slight decrease in coefficient of friction withalmost all analysed composites.On the other hand, regarding to wear of purePTFE and its composites, influence of fillermaterials is quiet significant. Presence of fillermaterial can increase wear resistance (decreasewear) up to 2 to 3 orders of magnitude. However, itcan be concluded that the best results, regarding towear resistance, were obtained by PTFE + bronzecomposites. Nevertheless, if we compare it to theother composites, that difference is not thatsignificant, i.e. similar wear resistance can beobtained with appropriate amount of othermentioned filler materials.ACKNOWLEDGEMENTFigure 10. Variation of specific wear rate with appliedload and sliding speed for PTFE and PTFE compositesThis work has been performed within theprojects TR 35021, TR 34028 and TR 35011. Theseprojects are supported by the Republic of Serbia,Ministry of Education, Science and TechnologicalDevelopment, whose financial help is gratefullyacknowledged.13 th International Conference on Tribology – Serbiatrib’13 139
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SerbianTribologySocietyFacultyofEng
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Serbian Tribology SocietyUniversity
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Supported byMinistry of Education,
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PrefaceThe International Conference
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ContentsPlenary Lectures1. THE GREE
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27. WEAR CHARACTERISTICS OF HYBRID
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Tribometry57. PRELIMINARY STUDY ON
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Plenary Lectures13 th International
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Serbian TribologySocietySERBIATRIB
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Figure 4. Diagram of the height and
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Realization of the approach is base
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edge without chamfer and smaller ra
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Figure 7. Accumulated tool life in
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Figure 13. Calculated and measured
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Friction deformation of the bronze
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engine cylinders of 2-cylinder-twot
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Table 1: Chemical composition of sa
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Table 4: Comparative wear-resistanc
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- measuring of coating thickness h
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Figure 5. Functional scheme of the
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Table 2. Test results for massive w
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knowledge transfer in the field ofm
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Table 1. Parameters of the electroc
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Figure 6. Wear resistance by linear
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coatings and observed their good we
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c)a)Figure 2: SEM images and micros
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Room temperature 300°CNi/µSiCNiNi
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COF [-] COF [-]Fig.9: COF graphs at
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about 260 nm is related to isolated
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contact’s conformity [18] they ob
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In order to calculate the metallic
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microscopic inspection of the Rp3 s
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otating plate. The shaft passes thr
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similar trends of variation are obs
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smooth, gear fiber-mild steel rough
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[2] Tabor, D.: “Friction and wear
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(10, 50 and 100 N) against surface
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[9] B.R. Gligorijevic, A. Vencl, B.
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dielectric properties, high resista
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parameter, Sv, was slightly influen
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dependence of roughness height and
Page 101 and 102: Serbian TribologySocietySERBIATRIB
Page 103 and 104: Polyethylenes with a molecular weig
Page 105 and 106: [9] K.S. Kanaga Karuppiah, A.L. Bru
Page 107 and 108: MgCO3•CaCO3 (13% Mg), and carnall
Page 109 and 110: fully compatible with MRI/MSCT imag
Page 111 and 112: 5. CONCLUSIONThe magnesium alloys a
Page 113 and 114: Zinc dialkyldithiophosphate (ZDDP)
Page 115 and 116: C- Lower deposits with NPNA on comb
Page 117 and 118: films. Carraro et al. [10] examined
Page 119 and 120: PlateCount No.Critical Load ( N)120
Page 121 and 122: solid melt of ZA27 alloy using mech
Page 123 and 124: SiC particles are uniformly distrib
Page 125 and 126: in number of micro-cracks and clust
Page 129 and 130: PBT has the average values of the f
Page 131 and 132: mechanical pressure and thermal loa
Page 135 and 136: 3. EXPERIMENTAL RESULTSTaking into
Page 137 and 138: [12] L. Blunt De, X. Jiang: Advance
Page 139 and 140: 2. EXPERIMENTALTESTING2.1 MaterialT
Page 141 and 142: figure 3a it could be seen that the
Page 145 and 146: and lubrication is done so that the
Page 147 and 148: 5. CONCLUSIONFigure 11. The accumul
Page 151: esistance was found for composite c
Page 157 and 158: The test contact pair meets the req
Page 159 and 160: complete. The SEM analysis maycontr
Page 163 and 164: tg( ) tg 100, [%] (2)tgwhere are:
Page 165 and 166: corresponding to the maximum value
Page 169 and 170: electrostatics [17]. Due to the fle
Page 171 and 172: 250nm size have been observed, acco
Page 173 and 174: ETH Zurich, Switzerland, where all
Page 175 and 176: comparison with the synthetic reinf
Page 177 and 178: 3. RESULTS AND DISCUSSION3.1 Micros
Page 179 and 180: (a)(b)Figure 4. Showing (a) variati
Page 181 and 182: composites. But the composite compo
Page 185 and 186: coated and uncoated region after ad
Page 187 and 188: has been measured between the top s
Page 189 and 190: Fig. 9 shows the wear track obtaine
Page 193 and 194: Mica samples preparationFor the ads
Page 195 and 196: According to the AFM results in fig
Page 197 and 198: [21] B. G. Sharma et al.: Character
Page 199 and 200: chemical vapor deposition method wi
Page 201 and 202: analysis (a) and an approximate che
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Table 3. Friction coefficients of s
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A.K.Oleynik, V.M.Matsevity, ea.]. /
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Most of the friction units of produ
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In order to provide both high parts
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Fig. 3. The comparison the criterio
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Table 3. Experimental and calculate
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For developing the numerical model
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,eccentricities and hydrodynamic pr
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hydrodynamic regime. However, for b
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to obtain the temperature distribut
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force (pressure) between two contac
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5E-06The total displacement [m]4.5E
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[11]. Figure 5 shows s the influenc
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efficiency of use, product quality,
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38GSA. The chemical composition, de
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niobium. It should be noted that fo
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Figure 1. Friction force on side su
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exploitation this changing is signi
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2. EFFICIENCY OF CYCLO DRIVEEfficie
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Figure 6. Dependence of cyclo drive
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common for their ability to be inst
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FNF (11)R sin cos11 21 22FNF
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Normal force [N]4000350030002500200
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analytical tests. The analytical te
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Table 4. Results of zero samples of
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noticeable, and by the end of explo
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4. PLASTIC BEARING APPLICATIONSRega
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For Elastohydrodynamic film thickne
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The results concluded for different
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For Thrust Force of 40KNKrytox 215
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Krytox 215 (µ = 0.03204 Pa.s)Figur
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- Reliable exploitation tools, prim
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In addition, as a result of cyclic
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AcknowledgementThe part of this res
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Thepressure angle can be calculated
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mechanism these parameters are fina
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causes big changes of their propert
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Table 2. Impact toughness of some t
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Figure 1. Appearance of fractured f
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implementation of these new manugac
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additional energy is dissipated due
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The adopted geometry parameters are
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4. CONCLUSIONTools of virtual produ
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Figure 2. Structure of the machinin
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3. ANALYSIS OF RESULTSThe results o
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Figure 15. Surface roughness regard
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From the analysis of the diagram it
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comparison from economic, energy co
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Advantages and disadvantages of tra
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The information provided by footwea
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Force (N)5,554,543,532,521,510,50Ex
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additives, that had been, until rec
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Figure 1. Test results for samples
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Table 7. Test results of oil sample
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Input parameters- Current intensity
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edge formed into a thin line. At th
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Lower values of current are not res
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Table 1. Chemical composition of si
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flowable at high temperatures and v
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holes (pits) emerge in the shape of
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[4] W. Schatt, K-P. Wieters, Pulver
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assumption allows us to use, instea
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where P is the load, a - radius of
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determination (total running in tim
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μm, compared with Figure 17, wich
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Serbian TribologySocietySERBIIATRIB
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Especially when the chain transfer
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is obvious that this isa so-calledw
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winches. The authors are inclined t
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find parameters of robot laser hard
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each of which is measured by the le
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Fractal dimensions were determined
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Figure 3. Modified force acting sch
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0.25Lubricant: L3DC 04Friction coef
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nanocomposites. The influence of fi
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4. RESULTS AND DISCUSSION4.1 Morpho
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Figure 6. Loading and unloadin vers
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3 8 12 1 4 2 4
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The material after qualifying the r
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It has already been mentioned that
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Degradation & Stability, Vol. 69, N
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conformance to researchers’ requi
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This part is assembled of pneumatic
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matrixes describe the state of the
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values influence of themeasurement
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Figure 1. Friction stir weldinga -
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(t 2 t
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M fr / T [-] [-]10.90.80.70.60.50.4
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M fr / T [-]10.90.80.70.60.50.40.30
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experimentally determined that for
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4. DISCUSSIONAccording to the theor
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2.1 The life cycle of the reportThe
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Obviously the report is checked and
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uticaja na osnovu kompozita, a time
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5. ZAKLJUČCIStruktura tiksolivene
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dobijene različite karakteristike
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vizuelno, na dnevnoj svetlosti, pod
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LITERATURA[1] Зинченко В.
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Slika 1. Rotorni bager - glodar VII
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stvaraju sliku stanja i svoja zapa
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njihovih kotrljanih elemenata. Mere
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postupka i uticaja parametara depoz
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posledica različite raspodele mikr
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ZrO 2 Y 2 O 3 je takođe zbog oksid
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3.2 Pneumatska osetljivostOblast pr
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p mg (δ), koji je zbog malih struj
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PNEUMATIC PROBE HEAD SELECTION FOR
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1. Podsistem kopanja2. Podsistem pr
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Slika 3. Kriva habanjaNa tom dijagr
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Mjereni su parametri habanja i pril
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preše prevladavaju kombinirani uvj
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a) b)Slika 5. Karakteristična mikr
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varijantnih materijala u dostavnom
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Jovanović D. 414, 446KKaleicheva J
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CIP - Каталогизација
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